Granted, at the end of the day, it still has a tree data structure consisting of TreeViewItem objects, but the similarities end there. The WPF TreeView control is very different. WinForms should have a Tree control instead of a TreeView control. By the same reasoning, we should call the Menu a MenuView and the ComboBox a ComboBoxView, but that is not the case. One could argue that the WinForms TreeView control’s name is a misnomer, because it can only show its own TreeNodes. You create a tree data structure in the control, where each node in the tree is of type TreeNode, and the control renders those nodes. The WinForms TreeView control is not really providing a “view” of a tree: it is the tree. After a while, I got used to the name and never gave it much thought, until now. NET 1.0 era, I don’t think any other control had the word “View” tacked onto the end of its name, except for ListView. Why not call it the Tree control? Why did they add the word “View” to the end? At the time, the. When I first started learning about Windows Forms, I thought the TreeView control had a strange name. My recent article about it, which, by the way, is my wedding gift to Sacha Barber, discusses how the ideal way of working with a TreeView is to bind it to a ViewModel, and then program against the ViewModel. Something just like this project! :)Īnd kudo's to the author for providing both C# and VB.I have been thinking a lot about the WPF TreeView control lately. And now I need a treeview that is not only searchable, but filterable too. I'm starting to grok it now, but it's taken me a bit. I don't know about you, but WPF treeviews have been one of my WPF learning speed bumps. The text input field should not occupy too much screen real estate, whilst at the same time being obvious enough for a first time user to find and understand.įurther, the components of the implementation should lend themselves to MVVM approach as it's likely that the visual appearance would be changed by the UI designers. The filter conditions should be remembered so that they could easily be re-used (personally, I think this is a bit superfluous as this type of control become really useful when the criterion one enters for the filtering are simple enough to be easily remembered). A text input field should accept input that prunes the tree view in real time (by real-time he meant there should be no need to hit Enter or something like that for the filtering to occur). Tree view should, when not filtered, behave like a normal tree view. When my friend requested this to be implemented he gave me a short list of requirements that it needed to fulfill: Two archives are provided, one for C# and one for VB.NET, so that each can read the sources in the language of their choice.įor the article, since there is so little code involved I've decided to have both the C# and VB.NET code present. This is obviously not a new problem nor is the internet lacking in example implementations, this article is based on something I did for a friend and I got several requests for the source code after posting it on YouTube so here it is.īecause the subject matter is fairly limited, this will be a relatively short article. I usually know roughly what I am looking for and it's often faster to type a portion of that than to visually inspect the entire tree, the Window 7 start-menu or the Windows 8 UI are fine examples of this approach being put to good use. Using filtering to prune or limit a tree view is something I find very useful and it really bugs me when I can't for example use it to quickly find the option I want to change in the Visual Studio Options. In this article I will demonstrate a WPF way of how to create a tree view to which filtering can be applied as a way of searching for a particular node or item in the tree.
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